<gm:page title="My App" authenticate="false">
  <gm:list id="photoFeed" template="galleryContent" data="http://spreadsheets.google.com/feeds/list/przGjQBDDk9nHbtybyXiGGg/1/public/basic"/>
  <gm:template id="galleryContent">
    <p repeat="true">
      <gm:image ref="atom:title"/>
    </p>
  </gm:template>    
</gm:page>